DocumentCode :
695845
Title :
Robustness margins separating process dynamics uncertainties
Author :
Larsson, Per-Ola ; Hagglund, Tore
Author_Institution :
Dept. of Autom. Control, Lund Univ., Lund, Sweden
fYear :
2009
fDate :
23-26 Aug. 2009
Firstpage :
543
Lastpage :
548
Abstract :
In controller design, not only set-point tracking and disturbance rejection can be considered, also robustness towards process uncertainties is a key issue. In this paper, new robustness measures that divide uncertainties into dead time and non-dead time uncertainties, are presented. It is shown, to the contrary of classic measures such as phase/gain/dead time margins, to guarantee stability towards simultaneous process changes, but at the same time being more flexible and less conservative than the robust control framework. The measures depend on extended sensitivity functions and are well illustrated in a Nyquist diagram giving valuable insight. Procedures to calculate the robustness margins are presented and examples are given.
Keywords :
Nyquist diagrams; control system synthesis; robust control; uncertain systems; Nyquist diagram; controller design; dead time uncertainties; disturbance rejection; nondead time uncertainties; process dynamic uncertainties; robust control framework; robustness margin; robustness measures; sensitivity functions; set-point tracking; stability; Decision support systems; Europe; Robustness; Uncertainty; Robustness; Stability; Time Delay; Uncertain systems;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Control Conference (ECC), 2009 European
Conference_Location :
Budapest
Print_ISBN :
978-3-9524173-9-3
Type :
conf
Filename :
7074459
Link To Document :
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